【摘要】 为解决以电缆为主的低压配电网络中合闸操作所产生的过电压问题,应用低压电缆系统的Bergeron等值计算模型和过电压计算方法对一个实际电气系统的合闸操作过电压进行计算,分析了过电压的影响因素及其物理意义。计算结果表明:这种低压电缆配电网合闸过电压幅值可能高达额定电压的50倍左右,过电压幅值与合闸时刻系统线路中所存储的电磁能量有关;这个电磁能量是合闸初相角φ和系统电缆线路长度的函数,过电压随φ呈近似正弦变化,随合闸电缆长度增加而降低,随运行电缆长度增加而升高。更多还原

【Abstract】 Switching overvoltages occur on the low voltage sides of distribution systems mainly consisting of cables.The Bergeron equivalent circuit model of an underground cable distribution network was used to model the switching overvoltages in real electrical system to analyze the factors affecting the overvoltages.The results show that the maximum switching overvoltage can be 50 times the rated voltage of the system,with the overvoltages related to the energy stored in the system lines when opening a switch.The energy changes sinusoidally with φ and is related to the length of the lines,with less energy in longer lines.更多还原